Suzuki DF25/DF30 Four Stroke Service Manual, Page 271Get this manual
DF2530 "K3" (2003) MODEL 12-3 Data
FUELOIL
Suzuki highly recommends that you use alcohol-free unleaded gasolinewith minimum pump octane rating of 87method) or 91 (Research method)However, blends of unleaded gasoline and alcohol with equivalent octane content may be used
Engine oil
API classification